UnicodeDecodeError occur when accessing the htmlBody property

[Newaij0]

Bug Metadata

• Version of extract_msg: 0.55.0
• Your python version: Python 3.10.20
• How did you launch extract_msg?
  • used the extract_msg package

Describe the bug
An UnicodeDecodeError error is thrown when accessing the htmlBody property. UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 0: incomplete multibyte sequence

Traceback

---------------------------------------------------------------------------
UnicodeDecodeError                        Traceback (most recent call last)
Cell In[10], line 1
----> 1 html_body = msg.htmlBody

File xxx/lib/python3.10/functools.py:981, in cached_property.__get__(self, instance, owner)
    979 val = cache.get(self.attrname, _NOT_FOUND)
    980 if val is _NOT_FOUND:
--> 981     val = self.func(instance)
    982     try:
    983         cache[self.attrname] = val

File xxx/lib/python3.10/site-packages/extract_msg/msg_classes/message_base.py:1174, in MessageBase.htmlBody(self)
   1172 elif self.rtfBody:
   1173     logger.info('HTML body was not found, attempting to generate from RTF.')
-> 1174     htmlBody = cast(bytes, self.deencapsulateBody(self.rtfBody, DeencapType.HTML))
   1175 # This is it's own if statement so we can ensure it will generate
   1176 # even if there is an rtfBody, in the event it doesn't have HTML.
   1177 if not htmlBody and self.body:
   1178     # Convert the plain text body to html.

File xxx/lib/python3.10/site-packages/extract_msg/msg_classes/message_base.py:257, in MessageBase.deencapsulateBody(self, rtfBody, bodyType)
    255             logger.exception('Custom deencapsulation function reported data is not encapsulated.')
    256     else:
--> 257         if self.deencapsulatedRtf and self.deencapsulatedRtf.content_type == 'html':
    258             return self.deencapsulatedRtf.html
    260 if bodyType == DeencapType.PLAIN:

File xxx/lib/python3.10/functools.py:981, in cached_property.__get__(self, instance, owner)
    979 val = cache.get(self.attrname, _NOT_FOUND)
    980 if val is _NOT_FOUND:
--> 981     val = self.func(instance)
    982     try:
    983         cache[self.attrname] = val

File xxx/lib/python3.10/site-packages/extract_msg/msg_classes/message_base.py:1014, in MessageBase.deencapsulatedRtf(self)
   1012 try:
   1013     deencapsultor = RTFDE.DeEncapsulator(body)
-> 1014     deencapsultor.deencapsulate()
   1015     return deencapsultor
   1016 except RTFDE.exceptions.NotEncapsulatedRtf:

File xxx/lib/python3.10/site-packages/RTFDE/deencapsulate.py:120, in DeEncapsulator.deencapsulate(self)
    118     raise MalformedEncapsulatedRtf(f"Malformed encapsulated RTF discovered:") from _e
    119 Decoder = TextDecoder()
--> 120 Decoder.update_children(self.full_tree)
    121 self.get_doc_tree()
    122 self.validate_encapsulation()

File xxx/lib/python3.10/site-packages/RTFDE/text_extraction.py:675, in TextDecoder.update_children(self, obj)
    673 self.set_font_info(obj)
    674 children = obj.children
--> 675 obj.children = [i for i in self.iterate_on_children(children)]

File xxx/lib/python3.10/site-packages/RTFDE/text_extraction.py:675, in <listcomp>(.0)
    673 self.set_font_info(obj)
    674 children = obj.children
--> 675 obj.children = [i for i in self.iterate_on_children(children)]

File xxx/lib/python3.10/site-packages/RTFDE/text_extraction.py:761, in TextDecoder.iterate_on_children(self, children)
    758     yield decoded_hex_tok
    759 elif isinstance(item, Tree):
    760     # Run this same function recursively on nested trees
--> 761     item.children = [i for i in self.iterate_on_children(item.children)]
    762     yield item
    763 else:

File xxx/lib/python3.10/site-packages/RTFDE/text_extraction.py:761, in <listcomp>(.0)
    758     yield decoded_hex_tok
    759 elif isinstance(item, Tree):
    760     # Run this same function recursively on nested trees
--> 761     item.children = [i for i in self.iterate_on_children(item.children)]
    762     yield item
    763 else:

    [... skipping similar frames: <listcomp> at line 761 (3 times), TextDecoder.iterate_on_children at line 761 (3 times)]

File xxx/lib/python3.10/site-packages/RTFDE/text_extraction.py:748, in TextDecoder.iterate_on_children(self, children)
    746 current_fontdef = self.font_table[self.font_stack[-1]]
    747 current_codec = current_fontdef.codec
--> 748 decoded_hex = decode_hex_char(base_bytes, current_codec)
    749 # We are replacing a Tree. So, need item.data to access it's info token
    750 decoded_hex_tok = Token('STRING',
    751                         decoded_hex,
    752                         start_pos=_hex_start_pos,
   (...)
    756                         column=_hex_start_column,
    757                         end_column=_hex_end_column)

File xxx/lib/python3.10/site-packages/RTFDE/text_extraction.py:627, in decode_hex_char(item, codec)
    624 if codec is None:
    625     # Default to U.S. Windows default codepage
    626     codec = 'CP1252'
--> 627 decoded = item.decode(codec)
    628 decoded = decoded.encode()
    629 if is_logger_on("RTFDE.text_extraction") is True:

UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 0: incomplete multibyte sequence

Additional context
I've noticed several similar issues such as #373, seamustuohy/RTFDE#19, #103, while same error still occur during usage. According to the traceback, the source of the error still seems to be the RTFDE package. Is there any method to fix this, or to get the formatted email body other than using the htmlBody property?

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